Letterman, what about Franken and Liddy?

On David Letterman's show, Letterman made the argument that G.Gordon Liddy is as repulsive as proud domestic terrorist William Ayers and then asked John McCain about McCain's ties to Liddy. Letterman's viewpoint is that Ayer's ties to Barack Obama were equivalent as McCain and Liddy's relationship.

Since Letterman believes Ayers = Liddy, will he continue to endorse Al Franken, who has an even more extensive relationship to Liddy? Or does Letterman think it's kinda hip to be hangin with terrorists?

Liddy on Franken's show (creator and executive producer)LateLine
Liddy and Franken's joint radio broadcast